Growth of 3D SnO2 nanosheets on carbon cloth as a binder-free electrode for supercapacitors
Growth of 3D SnO2 nanosheets on carbon cloth as a binder-free electrode for supercapacitors
复制标题
DOI：
10.1039/c5ta02479j
复制
发表时间：
2015-07
影响因子：
--
通讯作者：
Yadi Zhang;Zhongai Hu;Yarong Liang;Yuying Yang;N. An;Zhimin Li;Hong-ying Wu
中科院分区：
文献类型：
--
作者：
Yadi Zhang;Zhongai Hu;Yarong Liang;Yuying Yang;N. An;Zhimin Li;Hong-ying Wu
通过水热反应和随后的热处理，在碳布(CC)衬底上生长了三维(3D)片状SnO2。得到的3D片状SnO2/CC可以直接用作超级电容器的电极，而不需要添加粘结剂或导电物种，并且由于其独特的多孔结构，在电流密度为1Ag−1的情况下，在−0.6~0.3V的电势窗口内，比电容高达2 47Fg−1。为了匹配3D片状SnO2/CC在双电极体系中的电容行为，从GO出发制备了还原石墨烯氧化物/碳布(rGO/CC)。将rGO/CC和3D片状SnO2/CC分别作为正负极组装成非对称超级电容器。该器件不仅表现出良好的循环稳定性(3A g−1循环10000次后76.9%)，而且在1.7V的电池电压下，在850W kg−1的功率密度下，能量密度高达22.8W h kg−1，而且由于采用了中性电解液，所制备的超级电容器具有绿色和环保的特点。
Three-dimensional (3D) lamellar SnO2 is grown on a carbon cloth (CC) substrate (denoted as 3D lamellar SnO2/CC) through hydrothermal reactions and subsequent thermal treatments. The resulting 3D lamellar SnO2/CC can be directly used as an electrode in supercapacitors without the necessity for addition of either binder or conductive species, and achieves a specific capacitance as high as 247 F g−1 at a current density of 1 A g−1 within a potential window ranging from −0.6 to 0.3 V because of the unique porous structure accessible to electrolyte ions. In order to match the capacitive behaviors of 3D lamellar SnO2/CC in the two-electrode systems, reduced graphene oxide/carbon cloth (rGO/CC) is prepared by starting from GO. The rGO/CC and 3D lamellar SnO2/CC are respectively used as positive and negative electrodes to assemble an asymmetric supercapacitor. The device exhibits not only an excellent cycle stability (76.9% after 10 000 cycles at 3 A g−1), but also high energy density of 22.8 W h kg−1 at a power density of 850 W kg−1 under a cell voltage of 1.7 V. Moreover, the as-fabricated supercapacitor has green and environmentally friendly features because an aqueous neutral electrolyte is employed in it.